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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/10 = 100/x // - 100/x
30/10-(100/x) = 0
30/10-100*x^-1 = 0
-100*x^-1 = -3 // : -100
x^-1 = 3/100
-1 < 0
1/(x^1) = 3/100 // * x^1
1 = 3/100*x^1 // : 3/100
100/3 = x^1
x = 100/3
x = 100/3
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